Why is Silicon chosen as a dopant for SCS7?
A1. Silicon is selected after a systematic R&D research on various possible dopants and it was found that silicon provided excellent strengthening effect to SnCu matrix without affecting the electrical properties of the solder when added in very small quantity. It also reduces the rate of copper dissolution when exist in the intermetallics by acting as a barrier between solder and copper pads. In addition, Silicon is low in toxicity; the cost of Silicon is low and also stable as it is very abundant in the earth crust.
